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About the Role
Join our team and build the intelligent systems at the core of Cosuno's platform. Build and improve our LLM-powered systems, ship end-to-end features from model/agent through API to the TypeScript front-end, collaborate across teams, and maintain production AI systems.
Responsibilities
- Build and improve our LLM-powered systems that navigate the complex, often messy tendering workflow.
- Own features from model/agent through API to the TypeScript front-end — backend service, API, and the integration into the web app.
- Collaborate with Product, Engineering, and Data to translate business problems into shipped AI features.
- Monitoring, alerting, and continuous improvement of everything we deploy.
Requirements
- TypeScript, React, Node: Non-negotiable. You're comfortable shipping into our web app end-to-end — front-end, backend service, API.
- You have 5+ years writing production-grade Python. You write clean, well-structured code.
- You've shipped AI-powered features into a production web app and owned the integration from research code to real users.
- You have deep hands-on experience building and deploying LLM/agent systems — RAG, tool use, multi-step reasoning, evals.
- You design APIs, data pipelines, and services.
- You're comfortable with ambiguity and can judge when something is good enough to ship.
- You look at a complex system, quickly identify what matters, and decide what to do next.
- When you're unsure something will work, your instinct is to find out with data rather than keep wondering.
Skills
- TypeScript
- React
- Node
- Python
- LLM application
- RAG
- Agent systems
- Tool use
- Multi-step reasoning
- Evals
- Backend engineering
- API design
- Data pipelines
- Service design
- Product mindset
- Problem solving
- Bias for action
Location
- 100% remotely
- Berlin
Work Type
- Remote
- Office
- Flexible working hours
- Permanent contract
Experience Level
- 5+ years writing production-grade Python
Salary/Compensations
- Competitive salary above the market average
Benefits
- Competitive Compensation
- Work-Life Balance
- Choose to work 100% remotely or from our modern office in Berlin
- Flexible working hours
- New MacBook Pro
- Regular company off-sites and team events
- Job Security
- Permanent contract
About the Company
- Cosuno – Revolutionizing construction through technology.
- We are Cosuno – a fast-growing tech startup that is making the construction industry more efficient and transparent with our digital platform for tenders and procurement processes.
- Our goal: to solve the most complex challenges in the industry with innovation and simplicity.
- Artificial intelligence is the key to our solution: it analyzes millions of price data points and helps construction companies create precise and efficient bids.
- This not only saves our customers time but also helps them avoid unnecessary costs.
- At Cosuno, you will work with creative minds who are reshaping the construction industry.
- We believe in diversity because we know that the best ideas come from different perspectives.
- An integrative and inclusive work environment is a matter of course for us.
- Join us – Build the future of construction.